KR102204920B1 - Glass composition and cooking appliance - Google Patents

Abstract

The glass composition according to the embodiment includes a glass frit including a P ₂ O ₅ , SiO ₂ , B ₂ O ₃ , Group I oxide, BaO, NaF, TiO2, SnO, ZnO and an adhesion enhancing component, and the P ₂ O ₅ is included in an amount of 40% to 55% by weight with respect to the entire glass frit, the SiO ₂ is included in an amount of 5% to 15% by weight with respect to the entire glass frit, and the B ₂ O ₃ is the glass frit 5% to 10% by weight of the total, the Group I oxide is included as much as 3% to 10% by weight of the entire glass frit, and the ZnO is 10% to 25% by weight of the entire glass frit It is contained by weight%, and the TiO ₂ is contained by 0.1% to 5% by weight based on the entire glass frit.

Description

Glass composition and cooking equipment {GLASS COMPOSITION AND COOKING APPLIANCE}

The embodiment relates to a glass composition and a cooking appliance using the same.

Enamel is a glassy glaze applied to the surface of a metal plate. General enamel is used in cooking equipment such as microwave ovens and ovens. On the other hand, enamels are divided into acid-resistant enamels that prevent oxidation and heat-resistant enamels that can withstand high temperatures, depending on the type or use of the glaze. In addition, depending on the material added to the enamel, it is classified into aluminum enamel, zirconium enamel, titanium enamel, and soda glass enamel.

Such an enamel can form an enamel material, that is, a glass frit, and then pulverize the glass frit by a dry or wet process to form glass powder, and coat the object to be coated to form an enamel layer.

At this time, the enamel layer may be coated on the object, and then the enamel layer may be formed through a firing process at a constant temperature.

Such an enamel layer may be applied to an oven or the like, thereby implementing cleaning properties. However, there is a problem in that various bacteria, etc., may propagate in the enamel layer in a closed space, and bacteria in the oven may penetrate when cooking by such bacteria.

Therefore, there is a need for a glass composition having a new structure capable of inhibiting the penetration and reproduction of such bacteria.

The embodiment is to provide a glass composition having improved cleaning performance and antibacterial effect, and a cooking appliance using the same.

The glass composition according to the embodiment includes a glass frit including a P ₂ O ₅ , SiO ₂ , B ₂ O ₃ , Group I oxide, BaO, NaF, TiO2, SnO, ZnO and an adhesion enhancing component, and the P ₂ O ₅ is included in an amount of 40% to 55% by weight with respect to the entire glass frit, the SiO ₂ is included in an amount of 5% to 15% by weight with respect to the entire glass frit, and the B ₂ O ₃ is the glass frit 5% to 10% by weight of the total, the Group I oxide is included as much as 3% to 10% by weight of the entire glass frit, and the ZnO is 10% to 25% by weight of the entire glass frit It is contained by weight%, and the TiO ₂ is contained by 0.1% to 5% by weight based on the entire glass frit.

The glass composition according to the embodiment may have improved cleaning properties and durability.

Accordingly, it is possible to improve the cleaning performance of the cooking appliance. In detail, the cooking appliance can be easily cleaned just by soaking in water.

That is, even if the surface of the cavity, which is the inner space of the cooking appliance, and the surface of the door facing the cooking chamber in a state where the cooking chamber is shielded are contaminated by foods and organic substances generated during the cooking process, it can be easily cleaned by simply soaking water. .

In addition, since the cleaning property of the functional layer coated by the glass composition according to the embodiment is excellent, it is possible to easily clean the interior of the cooking appliance even when a small amount of energy is used.

In addition, the glass composition according to the embodiment may have improved antibacterial properties. In detail, the glass composition according to the embodiment may have improved antibacterial properties without affecting cleanability and durability.

Accordingly, it is possible to suppress the proliferation of bacteria, etc. that occur or propagate inside the cooking appliance.

In addition, since the glass composition according to the embodiment has a softening point and a coefficient of thermal expansion of a predetermined temperature or higher, it can withstand cooking and washing at a high temperature for a long time.

1 is a view showing a front view of a cooking appliance according to an embodiment.
2 and 3 are views showing an enlarged cross-sectional view of a part of the inner surface of the cavity of FIG. 1.
4 and 5 are views showing an enlarged cross-sectional view of a part of the rear surface of the door of FIG. 1.

Hereinafter, a glass composition according to an embodiment and a cooking appliance including the same will be described with reference to the drawings.

1 is a view showing a front view of a cooking appliance according to an embodiment.

Referring to FIG. 1, the cooking appliance 1 includes a cavity 11 in which a cooking chamber 12 is formed, a door 14 for selectively opening and closing the cooking chamber 12, and heating of food in the cooking chamber 12. It may include at least one heating source that provides heat for.

In detail, the cavity 11 may be formed in a hexahedral shape with an open front surface. The heating source includes a convection assembly 13 for discharging heated air into the cavity 11, an upper heater 15 disposed above the cavity 11, and a lower portion of the cavity 11. It may include a lower heater 16 is disposed. Of course, the heating source does not necessarily include the convection assembly 13, the upper heater 15, and the lower heater 16. That is, the heating source may include at least one of the convection assembly 13, the upper heater 15, and the lower heater 16.

The upper heater 15 and the lower heater 16 may be provided inside or outside the cavity 11.

2 to 5, functional layers may be disposed on the inner surface of the cavity 11 and the rear surface of the door 14, respectively.

The functional layer may include a glass composition described below. The functional layer may be formed by coating on the inner surface of the cavity 11 and the rear surface of the door 14. That is, the functional layer may be a coating layer.

The functional layer may serve to improve heat resistance, chemical resistance, and contamination resistance of the inner surface of the cavity 11 and the rear surface of the door 14.

2 and 3, a functional layer may be disposed in the cavity.

The cavity 11 may include a metal layer 11a and a functional layer 11b on the metal layer 11a.

The metal layer 11a may be a base material of the cavity.

Referring to FIG. 2, the functional layer 11b may be disposed in direct contact with the metal layer 11a.

Alternatively, referring to FIG. 3, the functional layer 11b may be disposed in indirect contact with the metal layer 11a. In detail, a buffer layer 11c may be disposed between the metal layer 11a and the functional layer 11b. The buffer layer 11c may include an adhesive layer. That is, adhesion between the metal layer 11a and the functional layer 11b may be improved by the buffer layer 11c.

4 and 5, a functional layer may be disposed on the rear surface of the door 14. In detail, a functional layer may be disposed on the rear surface of the door 14 facing the cooking chamber 12 while the cooking chamber 12 is shielded. The functional layer may serve to improve heat resistance, chemical resistance, and contamination resistance of the rear surface of the door 14.

The door 14 may include a metal layer 14a and a functional layer 14b on the metal layer 14a.

The metal layer 14a may be a base material of the cavity.

Referring to FIG. 4, the functional layer 14b may be disposed in direct contact with the metal layer 14a.

Alternatively, referring to FIG. 5, the functional layer 14b may be disposed in indirect contact with the metal layer 14a. In detail, a buffer layer 14c may be disposed between the metal layer 14a and the functional layer 14b. The buffer layer 14c may include an adhesive layer. That is, adhesion between the metal layer 14a and the functional layer 14b may be improved by the buffer layer 14c.

The functional layer may be formed by coating the glass composition on the inner surface of the cavity 11 or the rear surface of the door 14. In detail, the functional layer is coated on the inner surface of the cavity 12 and the rear surface of the door 14 to improve heat resistance, chemical resistance, and contamination resistance of the inner surface of the cavity 12 and the rear surface of the door 14. I can.

Hereinafter, a glass composition coated on the cavity and door of the cooking appliance will be described.

The glass composition according to the embodiment may include a glass frit including P ₂ O ₅ , SiO ₂ , B ₂ O ₃ , Group I oxide, BaO, NaF, TiO2, SnO, ZnO, and an adhesion enhancing component.

The P ₂ O ₅ may be included in an amount of about 55% by weight or less with respect to the entire glass frit. In detail, the P ₂ O ₅ may be included in an amount of about 40% to about 55% by weight based on the entire glass frit.

The P ₂ O ₅ is included in the glass composition, and the cleaning performance of the glass composition may be improved. When the P ₂ O ₅ is included in an amount of less than about 40% by weight with respect to the entire glass composition, the cleaning performance of the glass composition may be deteriorated. In addition, when the P ₂ O ₅ is contained in an amount exceeding about 55% by weight with respect to the total glass composition, thermal properties of the glass composition may be deteriorated, and vitrification of the glass composition may be weakened.

The SiO ₂ may be included in an amount of about 15% by weight or less based on the entire glass frit. In detail, the SiO ₂ may be included in an amount of about 5% to about 15% by weight based on the entire glass frit.

The SiO ₂ may be included in the glass composition to form the glass structure of the glass composition, improve the skeleton of the glass structure, and improve the acid resistance of the glass frit.

When the SiO ₂ is included in an amount of less than about 5% by weight with respect to the entire glass frit, the glass structure of the glass composition may be deteriorated, and thus durability of the functional layer may be deteriorated. In addition, when the SiO ₂ is included in an amount exceeding about 15% by weight with respect to the entire glass frit, the cleaning performance of the glass frit may be deteriorated.

The B ₂ O ₃ may be included in an amount of about 10% by weight or less based on the entire glass frit. In detail, the B ₂ O ₃ may be included in an amount of about 5% to about 10% by weight based on the entire glass frit.

The B ₂ O ₃ may perform a function of expanding the vitrification region of the glass frit and appropriately adjusting the thermal expansion coefficient of the glass composition according to the embodiment.

When the B ₂ O ₃ is included in an amount of less than about 5% by weight with respect to the entire glass frit, the vitrification area is reduced to reduce the glass structure, and thus the durability of the functional layer may decrease. In addition, when the B ₂ O ₃ is contained in an amount exceeding about 10% by weight with respect to the entire glass frit, the cleaning performance of the glass frit may be deteriorated.

The Group I-based oxide may include at least one metal oxide of Na ₂ O and K ₂ O. In detail, the Group I oxide may include Na ₂ O and K ₂ O. That is, the glass frit may contain both Na ₂ O and K ₂ O.

The Group I-based oxide may be included in an amount of about 10% by weight or less with respect to the entire glass frit. In detail, the Group I-based oxide may contain from about 3% to about 10% by weight based on the entire glass frit.

The Group I-based oxide may be included in the glass composition to improve cleaning performance of the glass composition. That is, the Group I-based oxide may improve cleaning performance of the glass composition together with the P ₂ O ₅ .

When the Group I-based oxide is included in an amount of less than about 3% by weight based on the entire glass frit, the cleaning performance of the glass composition may be deteriorated. In addition, when the Group I-based oxide is included in an amount exceeding about 10% by weight with respect to the entire glass frit, thermal properties of the glass composition may be deteriorated.

The P ₂ O ₅ , Na ₂ O and K ₂ O may form an alkali phosphate glass structure. In addition, the P ₂ O ₅ , Na ₂ O and K ₂ O may impart improved cleaning performance to the glass composition according to the embodiment.

That is, since the glass frit contains P ₂ O ₅ , Na ₂ O and K ₂ O, when the functional layer formed by the glass composition according to the embodiment is contaminated by food or the like, the functional layer is caused by water. Can be easily cleaned.

The BaO may be included in an amount of about 5% by weight or less based on the entire glass frit. In detail, BaO may be included in an amount of about 0.1% to about 5% by weight based on the entire glass frit.

The BaO may be included in the glass composition, and the glass structure of the glass composition may be strengthened, and a structure capable of maintaining the cleaning performance of the P2O5 may be continuously formed.

When the BaO is included in an amount of less than about 0.1% by weight with respect to the entire glass frit, the glass structure of the glass composition may be deteriorated, and thus durability and cleanability of the functional layer may be deteriorated. In addition, when the BaO is contained in an amount exceeding about 5% by weight with respect to the entire glass frit, hygroscopicity is increased by the BaO, and thus stable glass formation may be difficult.

The NaF may be included in an amount of about 2% by weight or less based on the entire glass frit. In detail, the NaF may be included in an amount of about 0.1% to about 2% by weight with respect to the entire glass frit.

The NaF may perform a function of appropriately controlling the surface tension of the coating film formed by the glass composition. In addition, the vitrified region of the glass frit can be enlarged by the NaF.

When the NaF is contained in an amount of less than about 0.1% by weight with respect to the entire glass frit, the vitrification area is reduced to reduce the glass structure, and thus the durability of the functional layer may decrease. In addition, when NaF is included in an amount exceeding about 5% by weight with respect to the entire glass frit, the cleaning performance of the glass frit may be deteriorated.

The SnO may be included in an amount of about 2% by weight or less based on the entire glass frit. In detail, the SnO may be included in an amount of about 0.1% to about 2% by weight with respect to the entire glass frit.

The SnO may perform a function of appropriately controlling the surface tension of the coating film formed by the glass composition.

When the SnO is included in an amount of less than about 0.1% by weight with respect to the entire glass frit, the vitrification area may be reduced, thereby deteriorating the glass structure. In addition, when the TiO ₂ and SnO are included in an amount exceeding about 2% by weight with respect to the entire glass frit, the cleaning performance of the glass frit may be deteriorated.

The TiO ₂ may be included in an amount of about 5% by weight or less based on the entire glass frit. In detail, the TiO ₂ may be included in an amount of about 0.1% to about 5% by weight with respect to the entire glass frit.

The TiO ₂ may improve the hiding power of the glass composition. That is, by the TiO ₂ , the hiding power of the coating layer of the glass composition coated on the functional layer may be improved.

When the TiO ₂ is contained in an amount of less than about 0.1% by weight with respect to the entire glass frit, when the glass composition is coated with a buffer layer or the like due to a decrease in hiding power, the color of the buffer layer may be visually recognized from the outside. In addition, when the TiO ₂ is included in an amount exceeding about 5% by weight with respect to the entire glass frit, the cleaning performance of the glass frit may be deteriorated.

The ZnO may be included in an amount of about 25% by weight or less based on the entire glass frit. In detail, the ZnO may be included in an amount of about 5% to about 25% by weight based on the entire glass frit. In more detail, the ZnO may be included in an amount of about 15% to about 25% by weight based on the entire glass frit.

The ZnO may be included in the glass composition, to strengthen the glass structure of the glass composition, and to continuously form a structure capable of maintaining the cleaning performance of the P ₂ O ₅ .

In addition, the ZnO may be included in the glass composition to improve antibacterial properties of the glass composition.

ZnO is an inorganic antibacterial agent, has good thermal stability, such as not causing volatilization or decomposition, is used as a drug carrier, cosmetics, has no toxicity to the human body, is inexpensive, has various advantages, such as having high antibacterial activity over Gram-positive and negative bacteria. For this reason, it is being actively studied as an antibacterial agent.

On the other hand, the antibacterial mechanism of ZnO has not yet been clearly proven, but it is known that antibacterial activity is generated by the following three principles.

First, it is known that the antibacterial activity of ZnO nanoparticles is caused by damage caused by reactive oxygen species (ROS) or ROS. In detail, electrons are trapped in oxygen vacancy existing on the surface of ZnO nanoparticles, and oxidation and reduction reactions are actively performed at this location, resulting in ROS. Oxidative stress is increased by the generated ROS, which can induce the death of bacteria.

Second, it is known that the antimicrobial activity of soluble ZnO nanoparticles is generated by the release of Zn ions. Since Zn ions have antimicrobial activity against various strains, Zn ions dissolved from ZnO nanoparticles in an aqueous solution may be the main cause of the antibacterial mechanism of ZnO nanoparticles.

Third, it is known that the antibacterial mechanism of ZnO nanoparticles is caused by the electrostatic attraction of ZnO nanoparticles and bacteria. ZnO nanoparticles with positive (+) charges are electrostatically attracted to the cell walls of bacteria with negative charges and can be adsorbed on the cell walls. ZnO nanoparticles adsorbed on the cell wall of the fungus can affect membrane fluidity and transport and transport across the membrane, resulting in the death of the fungus.

When the ZnO is included in an amount of less than about 10% by weight with respect to the entire glass frit, the antibacterial property of the glass composition may be deteriorated, the glass structure may be deteriorated, and thus durability and cleanability of the functional layer may be deteriorated. In addition, when the ZnO is contained in an amount exceeding about 25% by weight with respect to the entire glass frit, the hygroscopicity is increased by the ZnO, so that stable glass formation may be difficult.

Meanwhile, the TiO ₂ and the ZnO may be included in the glass composition in a certain ratio. In detail, TiO ₂ may be included in an amount smaller than that of ZnO.

In detail, the weight of TiO ₂ may be included in an amount of about 30% or less based on the weight of ZnO. In more detail, the weight of TiO ₂ may be included by about 10% to about 30% based on the weight of ZnO.

The weight ratio of TiO ₂ and ZnO is related to durability and antibacterial properties of the glass composition. In detail, when the weight of the TiO ₂ is less than about 10% of the weight of the ZnO, the antibacterial property is maintained, but as the amount of TiO ₂ is reduced and out of the vitrified area, the durability of the glass composition decreases. In addition, when the weight of TiO ₂ exceeds about 30% of the weight of ZnO, durability is maintained, but antibacterial properties by the ZnO may be deteriorated.

The glass frit may further include at least one of Co ₃ O ₄ , NiO, Fe ₂ O ₃ and MnO ₂ . In detail, the glass frit may include all of Co ₃ O ₄ , NiO, Fe ₂ O ₃ and MnO ₂ .

The Co ₃ O ₄ , NiO, Fe ₂ O ₃ and MnO ₂ may improve the adhesion of the glass composition coated on the base material. That is, the Co ₃ O ₄ , NiO, Fe ₂ O ₃ and MnO ₂ may be adhesion enhancing components that improve adhesion when the glass composition is coated on the buffer layer on the base material.

By the Co ₃ O ₄ , NiO, Fe ₂ O ₃ and MnO ₂ , when the glass composition is disposed on the buffer layer on the base material, the adhesion between the buffer layer and the functional layer can be improved, thereby improving reliability.

The Co ₃ O ₄ , NiO, Fe ₂ O ₃ and MnO ₂ may be included in an amount of about 4% by weight or less with respect to the entire glass frit. In detail, the Co ₃ O ₄ , NiO, Fe ₂ O ₃ and MnO ₂ may be included in an amount of about 0.1% to about 4% by weight with respect to the entire glass frit.

Hereinafter, the present invention will be described in more detail through a method of manufacturing a glass composition according to Examples and Comparative Examples. These examples are merely presented as examples to describe the present invention in more detail. Therefore, the present invention is not limited to these examples.

Property evaluation

As shown in Tables 1 and 2 below, a glass frit material was provided. Table 1 shows the composition of the ground coating layer serving as a buffer layer, and Table 2 shows the composition of the cover coating layer serving as a functional layer.

At this time, NH ₄ H ₂ PO ₄ was used as the raw material of the P ₂ O ₅ , and Na ₂ CO ₃ , K ₂ CO ₃ and BaCo ₃ were used as the raw materials of Na ₂ O, K ₂ O and BaO, respectively. , The remaining components were the same as those shown in Table 1.

Subsequently, after mixing the glass frit material, it was melted at a temperature of about 1400° C. for about 1 hour to about 2 hours, and then quenched by a quenching roller to obtain a glass cullet.

Then, about 0.1% to about 1% by weight of organopolysiloxane was added to the glass collet, milled for about 4 hours to about 6 hours in a ball mill, pulverized, and then, through a 325 mesh sieve, about 45 μm Filtered so as to have the following particle diameter, a glass frit was formed.

Subsequently, the ground coating layer serving as a buffer layer was sprayed onto a low-carbon steel sheet having a thickness of 200×200 (mm) and a thickness of 1 (mm) or less using a Corona discharge gun. The voltage of the discharge gun was controlled under the condition of 40 kV to 100 kV, and the amount of glass frit sprayed on the low carbon steel sheet was 300 g/m 2.

Subsequently, the low-carbon steel sprayed with the glass frit was fired for 300 to 450 seconds under a temperature condition of 830°C to 870°C to form a ground coating layer on one side of the low-carbon steel.

Subsequently, a functional layer was formed on the ground coating layer by the same process as described above.

Alternatively, a wet process may be used instead of the dry process as described above.

In detail, the glass composition was mixed with water at 1:1, and clay, aluminum oxide, borax, and bentonite were added and mixed for 10 hours.

Subsequently, the glass composition was sprayed onto a sheet of low carbon steel having a thickness of 200×200 (mm) and a thickness of 1 (mm) or less using an air spray gun. The amount of the glass composition sprayed on the low carbon steel sheet was 300 g/m 2.

Subsequently, the low-carbon steel sprayed with the glass composition is calcined for 180 to 360 seconds at a temperature of 840°C to 860°C to form a ground coating layer on one surface of the low-carbon steel, and then the ground coating layer is applied by the same process as described above. A functional layer was formed on.

Subsequently, evaluation of the properties of the functional layer manufactured according to the Examples and Comparative Examples was conducted.

In detail, the softening point (Td) and coefficient of thermal expansion of the functional layer were measured, and the cleaning performance of each functional layer was measured through a cleaning property test.

In detail, in order to measure the thermal properties of the glass, the pellet-type specimen was fired under the same conditions as the firing conditions of the glass composition, and both sides of the specimen were polished in parallel, and then a heating rate of 10°C/min was used using TMA (Thermo Machnical Analyzer). Thus, Td (softening point) and CTE (coefficient of thermal expansion) were measured.

In addition, the method of measuring the cleaning performance is to apply 1 g of chicken oil as a contaminant on the surface of the specimen coated with enamel on the test sample (200 × 200 (mm)) with a brush evenly and thinly, then put the test sample coated with the contaminant in a thermostat. , The contaminants were fixed at a temperature of about 250° C. and 1 hour.

After fixation, the test specimen was naturally cooled, the degree of curing was checked, and then immersed in a water bath of 70° C. for 10 minutes. Then, the cherry pie peeling was wiped as an example of cured chicken oil and sugar components with a force of 3 kgf or less with a wet cloth. The part to be wiped from the contaminated enamel surface was homogenized using a 5cm diameter flat bottom rod. At this time, as shown in Table 2, the number of round trips was measured and defined as the number of cleaning, and the evaluation indexes were shown in Tables 4 and 5.

Subsequently, evaluation of antibacterial properties of the functional layer prepared according to the Examples and Comparative Examples was conducted.

To measure the antibacterial properties of glass, the composition was fired on a 60×60 (mm) low-carbon steel plate, and a 150±50 µm thick specimen was fired under the firing conditions of enamel.

To measure antibacterial performance, drop 400µl E. coli solution (1.0·108 cells/m) on the surface of a 60×60 (mm) enameled sample, cover with sterile polyethylene film, and leave in a chamber at 35°C for 24 hours, and then remove the film. And 50ml sterile NaCl 0.85% solution. A method of counting the number of bacteria remaining after collecting 100 µl from the solution and cultured at 35° C. for 24 hours was used (JIS Z 2801), and the evaluation index was shown in Table 6 below.

Example 1 (wt%) Example 2 (wt%) Example 3 (wt%) Comparative Example (wt%) P ₂ O ₅ 54.3 54.3 57.2 30.7 Na ₂ O 2.8 3.7 3.1 8.5 K ₂ O 1.6 1.6 0.7 11.4 BaO 2.2 3.7 0.1 4.0 ZnO 23 20.1 18.3 14.1 SiO ₂ 0.1 5.5 5.5 14.7 B ₂ O ₃ 9.0 5.5 8.6 12.2 SnO 0.1 0.8 0.7 0.2 TiO ₂ 3.4 1.2 3.7 1.0 Co ₃ O ₄ 1.0 2.0 1.0 1.9 Fe ₂ O ₃ 1.0 1.0 0.1 0.8 NaF 1.5 0.6 0.6 0.5

Ground coating layer (wt%) Na ₂ O 15 K ₂ O 10.7 Li ₂ O 4.2 SiO ₂ 48.8 B ₂ O ₃ 10.1 TiO ₂ 2.4 Co ₃ O ₄ 1.0 NiO 0.5 Fe ₂ O ₃ 0.8 MnO ₂ 0.5 NaF 6.0

Number of cleaning rounds Performance (Level) 5 or less 5 15 times or less 4 25 times or less 3 50 or less 2 More than 50 times One

Example 1 Example 2 Example 3 Comparative example Softening point (℃) 550.2 521.2 502 501.5 Coefficient of thermal expansion (×10 ^-7 /℃) 91.2 95 88 89

Example 1 Example 2 Example 3 Comparative example Cleaning performance 5 5 5 5

Initial number of bacteria (cfu/ml ^-1 ) Number of bacteria (cfu/ml ^-1 ) after 24 hours Antibacterial activity Conversion of antibacterial activity (%) Sample 1.0*10 ⁷ 5.06*10 ⁸ 0 0 Example 1 1.0*10 ⁷ 3.87*10 ⁴ 4.12 99.99 Example 2 1.0*10 ⁷ 3.97*10 ⁴ 4.16 99.99 Example 3 1.0*10 ⁷ 3.84*10 ⁴ 4.10 99.99 Comparative example 1.0*10 ⁷ 4.85*10 ⁸ 0.04 99.99

Referring to Tables 4 and 5, it can be seen that the functional layers manufactured by the glass frit according to Examples and Comparative Examples have similar softening points and coefficients of thermal expansion.

In addition, it can be seen that the functional layer manufactured by the glass frit according to Examples and Comparative Examples has similar cleaning properties.

However, referring to Table 6, it can be seen that the functional layer manufactured by the glass frit according to the comparative example has significantly lower antibacterial properties than the functional layer manufactured by the glass frit according to the examples.

That is, it can be seen that the glass composition according to the embodiment has improved antibacterial properties without affecting the cleaning property by adding ZnO in the glass composition at a constant composition ratio.

Although the embodiments have been described above, these are only examples and do not limit the present invention, and those with average knowledge in the field to which the present invention belongs are not exemplified above without departing from the essential characteristics of the present embodiment. It will be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiment can be modified and implemented. And differences related to these modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

Claims (10)

P ₂ O ₅ , SiO ₂ , B ₂ O ₃ , Group I oxides, BaO, NaF, TiO2, SnO, ZnO and a glass frit containing an adhesion enhancing component,
The P ₂ O ₅ is included in an amount of 40% to 55% by weight based on the entire glass frit,
The SiO ₂ is included in an amount of 5% to 15% by weight based on the entire glass frit,
The B ₂ O ₃ is included in an amount of 5% to 10% by weight with respect to the entire glass frit,
The Group I-based oxide is included in an amount of 3% to 10% by weight with respect to the entire glass frit,
The ZnO is included in an amount of 15% to 25% by weight based on the entire glass frit,
The TiO ₂ is a glass composition containing 0.1% to 5% by weight based on the entire glass frit. The method of claim 1,
The BaO is contained in an amount of 0.1% to 5% by weight based on the entire glass frit,
The NaF is contained in an amount of 0.1% to 2% by weight based on the entire glass frit,
The SnO is a glass composition containing 0.1% to 2% by weight based on the entire glass frit. The method of claim 1,
The TiO ₂ is a glass composition containing 10% to 30% based on the weight of the ZnO. The method of claim 1,
The group I-based oxide is a glass composition containing Na ₂ O and K ₂ O. The method of claim 1,
The adhesion enhancing component includes at least one metal oxide of Co ₃ O ₄ , NiO, Fe ₂ O ₃ and MnO ₂ ,
The adhesion enhancing component is a glass composition containing 0.1% to 4% by weight based on the entire glass frit. A cavity in which a cooking chamber is formed;
A door selectively opening and closing the cooking compartment; And
And at least one heating source providing heat for heating the food in the cooking chamber,
At least one of the cavity and the door includes a metal base material and a functional layer on the metal base material,
The functional layer includes a glass frit including P ₂ O ₅ , SiO ₂ , B ₂ O ₃ , group I oxide, BaO, NaF, TiO2, SnO, ZnO, and an adhesion enhancing component,
The P ₂ O ₅ is included in an amount of 40% to 55% by weight based on the entire glass frit,
The SiO ₂ is included in an amount of 5% to 15% by weight based on the entire glass frit,
The B ₂ O ₃ is included in an amount of 5% to 10% by weight with respect to the entire glass frit,
The Group I-based oxide is included in an amount of 3% to 10% by weight with respect to the entire glass frit,
The ZnO is included in an amount of 15% to 25% by weight based on the entire glass frit,
The TiO ₂ cooking appliance containing 0.1% to 5% by weight based on the entire glass frit. The method of claim 6,
Cooking appliance further comprising a buffer layer disposed between the base material and the functional layer. The method of claim 6,
The BaO is contained in an amount of 0.1% to 5% by weight based on the entire glass frit,
The NaF is contained in an amount of 0.1% to 2% by weight based on the entire glass frit,
The SnO is a cooking appliance contained in an amount of 0.1% to 2% by weight based on the entire glass frit. The method of claim 6,
The TiO ₂ cooking appliance is included in an amount of 10% to 30% based on the weight of the ZnO. The method of claim 6,
The adhesion enhancing component includes at least one metal oxide of Co ₃ O ₄ , NiO, Fe ₂ O ₃ and MnO ₂ ,
The adhesion enhancing component is a cooking appliance containing 0.1% to 4% by weight based on the entire glass frit.

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